Polymorphic array JSON

{
   "meta":{
      "id":"f2a749b8-746d-4e8d-b877-93bc1392801c",
      "created":"2018-10-19T12:33:28.056Z",
      "updated":"2018-10-24T10:44:13.468Z"
   },
   "data":{
      "family_name":null,
      "given_name":null,
      "middle_name":null,
      "gender":null,
      "birthdate":null,
      "updated_at":1540377853,
      "email":"tmc@tmc.tmc",
      "email_verified":false,
      "address":{
         "street_address":null,
         "locality":null,
         "postal_code":null,
         "country":null
      },
      "phone_number":null,
      "phone_number_verified":false,
      "mobileNumberVerified":null,
      "aboutMe":null,
      "currentLocation":null,
      "display":null,
      "displayName":null,
      "externalId":null,
      "lastLogin":"2018-10-23 09:27:53 +0000",
      "deactivateAccount":null,
      "interests":[
         {
            "key":null,
            "details":{
               "lastUsed":1129806966087,
               "name":"Antwerpen Fina Poort 1",
               "stopId":"0"
            },
            "type":"stop"
         },
         {
            "key":null,
            "details":{
               "lastUsed":1540377852,
               "name":"Iddergem Rijksweg N45",
               "stopId":"0"
            },
            "type":"stop"
         },
         {
            "key":null,
            "details":{
               "location": "Halte Rotselaar Rotonde (304315)", 
        	   "locationDescription": "Halte Rotselaar Rotonde (304315)", 
               "lastUsed": 1129806966087, 
               "xLocation":175757, 
               "yLocation":180989 
            },
            "type":"location"
         },
         {
            "key":null,
            "details":{
               "departure":"Halte Leuven Station Perron 7 (303132)",
        	   "arrival":"Motstraat, Mechelen", 
        	   "bus":true, 
        	   "tram":true, 
        	   "train":true, 
        	   "metro":true, 
        	   "onDemandBus":false, 
        	   "xDeparture":174357, 
        	   "yDeparture":174698, 
        	   "xArrival":159081, 
        	   "yArrival":189448 
            },
            "type":"stop"
         }
      ]
   }
}